JPG to WebP Converter
Convert JPG/JPEG images to WebP format for smaller file sizes. No upload, no watermark, no signup. 100% private.
Drop your images here
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What you gain
WebP encodes photographic content more efficiently than JPEG, so the same picture at the same perceptual quality comes out roughly 25 to 35 percent smaller. On a page full of photos that is a real difference in load time.
It also avoids JPEG's worst habit. JPEG rings around hard edges, which is why text overlaid on a photo looks dirty. WebP handles those edges better at the same file size.
You are re-encoding, not converting losslessly
This is the thing to understand before doing it in bulk. Your JPEG has already thrown detail away. Re-encoding it as WebP throws a second, smaller amount away on top, because the encoder is compressing an image that already contains compression artefacts.
At a quality setting of 0.85 or above the second generation is invisible. Below about 0.7 it starts compounding with the first and you can see it. If you still have the original camera file, converting from that rather than from the JPEG gives a better result at the same size.
More detail
Where it will not help
An already heavily-compressed JPEG has little left to give, and converting it can even produce a larger file, because the encoder faithfully reproduces the blocking artefacts it was handed. Check the output size before converting a whole folder.
Transparency is not a factor here in either direction: JPEG has none to preserve, so you gain the capability but not any actual alpha.
Questions
How much smaller is WebP than JPEG?
Around 25 to 35 percent for the same perceptual quality on typical photographs. The gap narrows on images that were already compressed hard, where there is little redundancy left to exploit.
Does converting lose quality?
Yes, a second generation of it, because a lossy source is being lossily re-encoded. At quality 0.85 and above that is not visible. It becomes visible when you convert an already low-quality JPEG at a low setting.
Why did my file get bigger?
The source JPEG was already compressed hard, so the WebP encoder spent bits faithfully reproducing its blocking artefacts. When that happens, the original is already about as small as it usefully gets.
Do I need a fallback image for older browsers?
Not in practice. Every current browser supports WebP. Fallbacks matter only outside the browser, in email clients and older desktop software.